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Characteristics: This curtain sensor are special designed for automatic sliding door to detection and keep safety.High accuracy. Advanced infrared scanning technology.Stable and reliable. Have function of background self-learn.Can learn background auto-matically when power on.Suit all kinds of occasions. Always self-correcting once be influenced by quake,distortion,move,dark and sunshine.Ensure the sensor can work durable. Parameter: Power supply: AC/DC12-30V Type of ray: Infrared light modulation Photosource: Infrared 940mm/37in Light beam: 8 channel transmit,8 channel receive Quiescent current: 35mA Working current: 73mA Self-learn time: 15s Operating display: Standby/Blue LED, Detecting/Red LED Temperature range: -40℃~60℃ / -40℉~140℉ Maximum installation: 2500mm / 98.42in Maximum detection area: 2000(W)x500(D)mm / 78.7(W)x19.7(D)in Hold-up time: 500ms Response time: